exam Maths Puzzle Numerical Ability

Evaluate, if possible
√4/25

THis is my radical symbol √

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exam Other Question

Tanya has ten bills in her wallet. She has a total of $40. If she has one more $5 bill than $10 bills, and two more $1 bills than $5 bills, how many of each does she have? i filled pages to find the answer but i dont think its right please help!

Here is the problem:

How long of a shadow would light 30 feet off the ground make when shining on an object 10 feet tall that is 20 feet away from the light?